```css
/* ===== 西瓜视频企业官网 - 完整样式表 ===== */
/* 设计系统变量 */
:root {
  --bg: #FFFFFF;
  --bg-soft: #F7F9F8;
  --bg-gradient: linear-gradient(135deg, #0B2E21 0%, #1F6F4A 50%, #2F8F5B 100%);
  --text-primary: #1F2937;
  --text-secondary: #243447;
  --text-muted: #334155;
  --text-link: #1F6F4A;
  --text-link-hover: #0F4A2E;
  --border-color: #D1D5DB;
  --card-bg: #FFFFFF;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --btn-bg: #1F6F4A;
  --btn-text: #FFFFFF;
  --footer-bg: #1E2A32;
  --footer-text: #E2E8F0;
  --footer-text-muted: #A0B3C0;
  --heading-color: #111827;
  --shadow-color: rgba(0, 0, 0, 0.06);
  --shadow-hover: rgba(0, 0, 0, 0.12);
  --code-bg: #F3F4F6;
  --svg-text: #1F2937;
  --banner-overlay: rgba(0, 0, 0, 0.35);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --info: #3B82F6;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

[data-theme="dark"] {
  --bg: #12181F;
  --bg-soft: #1E242C;
  --text-primary: #E5E7EB;
  --text-secondary: #E2E8F0;
  --text-muted: #A0B3C0;
  --text-link: #6AB58A;
  --text-link-hover: #8ED0A6;
  --border-color: #3A4A5A;
  --card-bg: #1E242C;
  --nav-bg: rgba(18, 24, 31, 0.92);
  --btn-bg: #2F7A55;
  --btn-text: #FFFFFF;
  --footer-bg: #0F141A;
  --footer-text: #E2E8F0;
  --footer-text-muted: #9AAAB8;
  --heading-color: #F8FAFC;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.5);
  --code-bg: #2A323C;
  --svg-text: #E2E8F0;
  --banner-overlay: rgba(0, 0, 0, 0.55);
  --glass-bg: rgba(30, 36, 44, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ===== 基础重置与全局样式 ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--text-link) var(--bg-soft);
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  transition: background-color var(--transition-normal), color var(--transition-fast);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-link-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--text-link);
  color: white;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-soft);
}

::-webkit-scrollbar-thumb {
  background: var(--text-link);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-link-hover);
}

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
}

.logo {
  flex-shrink: 0;
}

.logo a {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--heading-color);
  text-decoration: none;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.logo span {
  color: var(--text-link);
  position: relative;
}

.logo a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--text-link);
  border-radius: 2px;
  transition: width var(--transition-normal);
}

.logo a:hover::after {
  width: 100%;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--text-link);
  border-radius: 2px;
  transition: width var(--transition-normal);
}

.nav-links a:hover {
  color: var(--text-link-hover);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border-color);
  border-radius: 40px;
  padding: 4px 8px 4px 16px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.search-box:focus-within {
  border-color: var(--text-link);
  box-shadow: 0 0 0 3px rgba(31, 111, 74, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  outline: none;
  width: 170px;
  font-size: 0.9rem;
  padding: 4px 0;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 30px;
  padding: 6px 16px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.85rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
  background: var(--text-link-hover);
  transform: scale(1.02);
}

/* 暗黑模式切换按钮 */
.dark-toggle {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 8px 16px;
  border-radius: 30px;
  font-weight: 500;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.dark-toggle:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 移动菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--bg-soft);
  border-color: var(--text-link);
}

/* 移动菜单 */
.mobile-nav {
  display: none;
  background: var(--bg);
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
  box-shadow: 0 8px 20px var(--shadow-color);
}

.mobile-nav.active {
  display: block;
  animation: slideDown var(--transition-normal);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav a {
  display: block;
  padding: 12px 24px;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  background: var(--bg-soft);
  color: var(--text-link);
  padding-left: 32px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 12px 28px;
  border-radius: 40px;
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(31, 111, 74, 0.2);
  text-align: center;
  font-size: 1rem;
  line-height: 1.5;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-normal);
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(31, 111, 74, 0.3);
  color: white;
}

.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--text-link);
  color: var(--text-link);
  box-shadow: none;
}

.btn-outline:hover {
  background: var(--text-link);
  color: white;
  box-shadow: 0 4px 12px rgba(31, 111, 74, 0.2);
}

.btn-light {
  background: white;
  color: #1F6F4A;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-light:hover {
  background: #f0fdf4;
  color: #1F6F4A;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.7);
  color: white;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: none;
  backdrop-filter: blur(4px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ===== Banner 首屏 ===== */
.banner {
  background: var(--bg-gradient);
  color: white;
  border-radius: var(--radius-xl);
  margin: 28px 0 40px;
  padding: 48px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  box-shadow: 0 12px 40px var(--shadow-color);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  transform: rotate(30deg);
  z-index: -1;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle, rgba(0, 0, 0, 0.2) 0%, transparent 70%);
  z-index: -1;
}

.banner-text {
  max-width: 600px;
  z-index: 2;
  position: relative;
}

.banner h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  color: white;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 0.8s ease;
}

.banner p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 24px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
  animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.banner-illustration {
  z-index: 2;
  animation: float 3s ease-in-out infinite;
}

.banner-illustration svg {
  width: 220px;
  height: auto;
  opacity: 0.95;
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: 0.9rem;
  padding: 12px 0;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  text-decoration: underline;
  color: var(--text-link-hover);
}

.breadcrumb span {
  color: var(--text-muted);
}

/* ===== 区块标题 ===== */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--heading-color);
  margin: 40px 0 20px;
  border-left: 6px solid var(--text-link);
  padding-left: 16px;
  position: relative;
  transition: color var(--transition-normal);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 16px;
  width: 60px;
  height: 3px;
  background: var(--text-link);
  border-radius: 2px;
  opacity: 0.5;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 20px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--text-link);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px var(--shadow-hover);
  border-color: var(--text-link);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  color: var(--heading-color);
  font-size: 1.3rem;
  margin-bottom: 12px;
  font-weight: 700;
  transition: color var(--transition-fast);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card .more {
  color: var(--text-link);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
  transition: gap var(--transition-fast);
}

.card .more:hover {
  gap: 8px;
  color: var(--text-link-hover);
}

/* ===== 文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-item {
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  border-left: 4px solid var(--text-link);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.article-item::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(31, 111, 74, 0.05));
  transition: width var(--transition-normal);
}

.article-item:hover {
  transform: translateX(8px);
  box-shadow: 0 4px 16px var(--shadow-color);
  border-left-color: var(--text-link-hover);
}

.article-item:hover::after {
  width: 100%;
}

.article-item h4 {
  color: var(--heading-color);
  font-size: 1.2rem;
  margin-bottom: 6px;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.article-item .meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-item .meta::before {
  content: '📅';
  font-size: 0.8rem;
}

.article-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.article-item a {
  color: var(--text-link);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
  z-index: 1;
}

.article-item a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

/* ===== FAQ 手风琴 ===== */
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  margin-bottom: 12px;
  border-radius: var(--radius-md);
  padding: 0 20px;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--text-link);
}

.faq-item.open {
  border-color: var(--text-link);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  cursor: pointer;
  color: var(--heading-color);
  font-weight: 600;
  font-size: 1.05rem;
  user-select: none;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--text-link);
}

.faq-question::after {
  content: '+';
  font-size: 1.8rem;
  color: var(--text-link);
  font-weight: 300;
  transition: transform var(--transition-normal), color var(--transition-fast);
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
  color: var(--text-link-hover);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
  color: var(--text-secondary);
  border-top: 1px solid transparent;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 12px 0 18px;
  border-top-color: var(--border-color);
}

/* ===== 表格 ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 2px 10px var(--shadow-color);
  margin-bottom: 20px;
}

.info-table th,
.info-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.info-table tr:last-child td {
  border-bottom: none;
}

.info-table th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--heading-color);
  width: 160px;
}

.info-table tr:hover td {
  background: var(--bg-soft);
}

/* ===== HowTo 步骤 ===== */
.howto-step {
  background: var(--bg-soft);
  border-left: 6px solid var(--text-link);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin: 12px 0;
  transition: all var(--transition-fast);
}

.howto-step:hover {
  transform: translateX(4px);
  box-shadow: 0 2px 8px var(--shadow-color);
}

.howto-step h4 {
  color: var(--heading-color);
  font-size: 1.1rem;
  margin-bottom: 6px;
  font-weight: 600;
}

.howto-step p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  margin-top: 60px;
  padding: 40px 0 24px;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--bg-gradient);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 30px;
}

.footer-col h5 {
  color: #FFFFFF;
  font-size: 1.1rem;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--text-link);
  padding-bottom: 8px;
  font-weight: 600;
  display: inline-block;
}

.footer-col a {
  display: block;
  color: var(--footer-text-muted);
  text-decoration: none;
  margin-bottom: 8px;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  position: relative;
  padding-left: 0;
}

.footer-col a::before {
  content: '›';
  position: absolute;
  left: -12px;
  opacity: 0;
  transition: all var(--transition-fast);
}

.footer-col a:hover {
  color: #FFFFFF;
  padding-left: 16px;
}

.footer-col a:hover::before {
  opacity: 1;
  left: 0;
}

.footer-bottom {
  border-top: 1px solid #2E3F4B;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--footer-text-muted);
  font-size: 0.9rem;
}

.footer-bottom span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ===== 返回顶部 ===== */
.to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--btn-bg);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  border: none;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  transform: translateY(20px);
}

.to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--text-link-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 数字动画 ===== */
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-link);
  line-height: 1.2;
}

/* ===== 工具类 ===== */
.text-muted {
  color: var(--text-muted);
}

.text-link {
  color: var(--text-link);
}

.text-secondary {
  color: var(--text-secondary);
}

.bg-soft {
  background: var(--bg-soft);
}

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 0.25rem;
}

.mt-2 {
  margin-top: 0.5rem;
}

.mt-3 {
  margin-top: 1rem;
}

.mt-4 {
  margin-top: 1.5rem;
}

.mt-5 {
  margin-top: 2rem;
}

.mb-1 {
  margin-bottom: 0.25rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-3 {
  margin-bottom: 1rem;
}

.mb-4 {
  margin-bottom: 1.5rem;
}

.mb-5 {
  margin-bottom: 2rem;
}

.p-1 {
  padding: 0.25rem;
}

.p-2 {
  padding: 0.5rem;
}

.p-3 {
  padding: 1rem;
}

.p-4 {
  padding: 1.5rem;
}

.p-5 {
  padding: 2rem;
}

/* ===== 响应式布局 ===== */
@media (max-width: 1200px) {
  .container {
    max-width: 960px;
  }

  .banner h1 {
    font-size: 2.4rem;
  }

  .banner-illustration svg {
    width: 180px;
  }
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .search-box {
    display: none;
  }

  .banner {
    padding: 32px 24px;
  }

  .banner h1 {
    font-size: 2.2rem;
  }

  .banner p {
    font-size: 1.1rem;
  }

  .banner-illustration svg {
    width: 150px;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .footer-grid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .nav-wrapper {
    padding: 10px 0;
  }

  .logo a {
    font-size: 1.4rem;
  }

  .dark-toggle {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  .banner {
    padding: 24px 20px;
    margin: 16px 0 24px;
    border-radius: var(--radius-lg);
  }

  .banner h1 {
    font-size: 1.8rem;
  }

  .banner p {
    font-size: 1rem;
  }

  .banner-illustration {
    display: none;
  }

  .banner-cta {
    flex-direction: column;
    gap: 12px;
  }

  .banner-cta .btn {
    width: 100%;
    text-align: center;
  }

  .section-title {
    font-size: 1.5rem;
    margin: 32px 0 16px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 20px;
  }

  .article-item {
    padding: 16px 20px;
  }

  .article-item h4 {
    font-size: 1.1rem;
  }

  .info-table th,
  .info-table td {
    padding: 12px;
  }

  .info-table th {
    width: 120px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .logo a {
    font-size: 1.2rem;
  }

  .dark-toggle {
    padding: 4px 10px;
    font-size: 0.75rem;
  }

  .mobile-menu-btn {
    padding: 4px 8px;
    font-size: 1rem;
  }

  .banner {
    padding: 20px 16px;
  }

  .banner h1 {
    font-size: 1.5rem;
  }

  .banner p {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.3rem;
    padding-left: 12px;
  }

  .card {
    padding: 16px;
    border-radius: var(--radius-md);
  }

  .card h3 {
    font-size: 1.1rem;
  }

  .card p {
    font-size: 0.9rem;
  }

  .article-item {
    padding: 14px 16px;
  }

  .article-item h4 {
    font-size: 1rem;
  }

  .article-item p {
    font-size: 0.9rem;
  }

  .faq-question {
    font-size: 0.95rem;
    padding: 14px 0;
  }

  .faq-answer {
    font-size: 0.9rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-col h5 {
    font-size: 1rem;
  }

  .footer-col a {
    font-size: 0.9rem;
  }

  .footer-bottom {
    font-size: 0.8rem;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .site-header,
  .site-footer,
  .to-top,
  .mobile-menu-btn,
  .dark-toggle,
  .search-box,
  .banner-cta {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .article-item,
  .faq-item,
  .info-table {
    box-shadow: none;
    border: 1px solid #ddd;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* ===== 无障碍与焦点样式 ===== */
:focus-visible {
  outline: 3px solid var(--text-link);
  outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--text-link);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
```